I've done both previously and was choosing between them after christmas. It took me a while to decide but I settled on WW and it's going well so far!
I too felt that on SW I over indulged on carbs and was having ridiculous dinners like a huge baked potato with a whole pack of batchelors pasta and sauce dumped on top. It's no wonder my weight losses slowed to a halt! I think WW helps me with portion control, but I did find I was hungry a lot last time round although this isn't an issue now with PP. I also like that PP gives you the extra PP allowance already saved up to use for weekend treats, etc. Going out for dinner and drinks tonight with OH and haven't even had to think about saving points, etc - magic!
Good luck with it - let us know how you get on!